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Dated: Sep. 11, 2013

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VPN supplies network connectivity over possibly long physical distance. In this sense, VPN is a form of a wide area network (WAN). VPN allows file sharing, video conferencing and similar network services. Virtual private networks generally do not provide any new functionality that is not already offered through alternative mechanisms, but VPN applies those services more efficiently/less costing in most cases.

A key feature of a VPN is its ability to work across private networks and public networks such as the Internet. Using a method called tunnel VPN uses the same hardware infrastructure as existing Internet or intranet connections. VPN technologies includes various security mechanisms for the protection of virtual private networks.

Specifically, a VPN supports at least three different modes of use:

Internet Remote access client connections

LAN-to-LAN internetworking

Controlled access within an intranet

In recent years, many organizations have increased the mobility of their workers by allowing more employees to telecommute. Employees also continue to travel and face a growing need to stay connected to their corporate networks.

VPN can be configured to support remote, protected access to corporate houses offices over the Internet. Internet VPN solution uses a client/server design and it works as below:

Remote host (client) wanting to log on to the company network first connects to any public Internet service provider (ISP).

Furthermore, the host initiates a VPN connection to the VPN server of the company. This connection is made through a VPN client installed on the remote host.

Once the connection is established, the remote client can communicate with the internal systems of the company over the Internet as if it were a local host.

Before VPNs, remote workers access corporate networks over private leased lines or dial-up access to remote servers. While VPN clients and servers require installation of hardware and software, Internet VPN is a great solution in many situations.In addition to using a virtual private network for remote access VPN can bridge two networks together. In this mode, the entire remote network (rather than a single remote client) can join the other network to form an extended intranet. This solution uses a VPN server for the VPN connection to the server.

Intranet / local network VPN

Internal networks may also use VPN technology to implement controlled access to individual subnets within a private network. In this mode, VPN clients connect to the VPN server, which acts as a gateway.

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